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Comparison of Two Sampling Methods for Assessing Halyomorpha halys (Hemiptera: Pentatomidae) Numbers in Soybean

B L Aigner1, D A Herbert1, G P Dively1

  • 1Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0319 (baigner@vt.edu; herbert@vt.edu; galen@umd.edu; dilip@umd.edu; jwhalen@udel.edu; bcissel@udel.edu; tkuhar@vt.edu; carlyleb@vt.edu; hogue@vt.edu; eseymore@vt.edu).

Journal of Economic Entomology
|October 17, 2016
PubMed
Summary

Visual inspection effectively samples the brown marmorated stink bug in soybean fields. This method, counting bugs on plants, offers a reliable alternative to traditional sweep nets for pest management.

Keywords:
Halyomorpha halyssamplingsoybeanstink bug

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Area of Science:

  • Agricultural Entomology
  • Pest Management
  • Soybean Production

Background:

  • The brown marmorated stink bug (Halyomorpha halys) poses a significant challenge for soybean pest monitoring.
  • Its characteristic "startle response" complicates traditional sampling methods like sweep nets.
  • Effective population assessment is crucial for timely and accurate pest management decisions.

Purpose of the Study:

  • To evaluate the efficacy of a visual plant inspection method for sampling the brown marmorated stink bug in soybean fields.
  • To compare the visual inspection method with traditional sweep net sampling.
  • To establish a relationship between visual counts and established economic thresholds.

Main Methods:

  • A 2-minute visual inspection of soybean plants was conducted while walking between rows.
  • A 30-minute interval allowed for stink bug repositioning before resampling.
  • The area was then sampled using 15 sweeps with a 38-cm-diameter sweep net.
  • Data from 76 fields and 2,042 paired comparisons were analyzed.

Main Results:

  • A strong linear relationship was found between visual counts and sweep net samples (R² = 0.6934).
  • An average visual count of 5.4 brown marmorated stink bugs in 2 minutes correlated with the economic threshold of 5 bugs per 15 sweeps.
  • The visual inspection method demonstrated effectiveness in assessing pest populations.

Conclusions:

  • Visual plant inspection is a viable and effective alternative for monitoring brown marmorated stink bug populations in soybeans.
  • This method can aid in making informed pest management decisions.
  • Further adoption of visual inspection can improve sampling efficiency and accuracy.